Updated the user billing process to add a return to home function and redirect users to their specific account page after payment. Enhanced error handling in the billing event handler to handle scenarios where no account id is found in the subscription. Removed unused billing page object from the stripe page object.
Code for billing process was refactored in end-to-end tests for clean code and better structure. In the described tests, related codes and classes have been moved to a new class named BillingPageObject. All corresponding calls were updated accordingly.